Analyse net profit over several consecutive periods on a consistent basis, look at both the pound figure and the margin, and separate movements caused by trading from movements caused by one-off items or accounting changes. Three to five years of comparable data usually shows the underlying direction far better than any single year.
A few methods work well in practice. Line-by-line comparison of the profit and loss account across periods shows which cost has actually moved. Expressing every line as a percentage of revenue removes the effect of growth and reveals whether margins are holding. Rolling twelve-month figures smooth out seasonality in businesses where quarter-to-quarter comparison is misleading.
Once you have the trend, ask what is driving it. Net profit can fall while trading improves — for example, after a significant asset purchase increases the depreciation charge — and it can rise for reasons unconnected to trading, such as a one-off gain. Stripping out exceptional items gives a cleaner underlying series.
Finally, check the trend against cash. If net profit is rising but cash is not, look at debtor days, stock levels and capital repayments. A widening gap between profit and cash generation is worth understanding early.
Lenders reviewing an application typically examine this kind of trend rather than one year’s accounts, which is why a clear explanation of any unusual period is useful to have ready. This is general information, not accounting advice — your accountant can help you prepare a consistent comparison.